Actually, you can disable the navigation which comes from the Flat mode. You can use the EnableBuiltInNavigation property of the PropertyGridCommandProvider. Please check the following code snippet for a reference:
this.RadPropertyGrid.CommandProvider = new CustomKeyboardCommandProvider(this.RadPropertyGrid);
public class CustomKeyboardCommandProvider : PropertyGridCommandProvider
public CustomKeyboardCommandProvider(RadPropertyGrid propertyGrid)
this.PropertyGrid = propertyGrid;
this.EnableBuiltInNavigation = false;
I hope this will work for you.
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